Casing-spear.



F. G. BAKER.

CASING SPEAK.

APPLICATION FILED NOV. 15, 1911.

Patented July 23, 1912.

3 SHEETS-SHEET 1.

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Httouuqf) COLUMBIA PLANOORAPH JO-,WMKINGTDN, D1 c.

F. G. BAKER.

CASING SPEAR APPLIGATIION FILED NOV. 15, 1911.

' Patented July 23, 1912.

3 SHEETS-SHEET 2 P. C; BAKER.

CASING SPEAR.

APPLICATION FILED NOV.15, 1911.

' Patented July 23, 1912.

3 SHEETS-SHEETii.

COLUMBIA PLANOORAPH c0, WASHINGTON. D. c.

UNITED STATES OFFICE.

FRANK C. BAKER, OF BRIDGEPOBT, ILLINOIS, ASSIGNOR 0F ONE-HALF T0 0. II. TRACY,

OF BRIDGEPORT, ILLINOIS.

CASING-SPEAK.

Specification of Letters Patent.

Patented July 23, 1912.

To all whom it may concern:

Be it known that I, FRANK C. BAKER, a citizen of the United States, residing at Bridgeport, in the county of Lawrence, itlon of a spear constructed in accordance State of Illinois, have invented certain new and useful Improvements in Casing-Spears; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an improvement horizontal sectional vlew taken on the line in casing spears adapted for removing the casing from Artesian or oil wells.-

One object of the invention is to provide a spear for the purpose described which is provided with a body portion having an opposed pair of wedges slidably mounted thereon and formed in such a manner as to insure a uniform gripping action with the casing.

Another object of the invention is to provide a spear of the character described in which a spring actuated collar is mounted upon the body portion below the wedges, and is adapted to be positively held in an adjusted position so that the limit of movement of the wedges may be regulated in proportion to the size of thecasing to be removed.

A further object of the invention is to provide an abutment or collar for the purpose described which is formed in a novel manner to permit of a clamp to be engaged therewith to slide the same along the body portion against the tension of the spring.

A still further object of the invention is to provide a spear of the character described, which is composed of a minimum number of parts, is therefore simple in con struction, is positive in operation, and is cheap to manufacture.

With these and other objects in view, the invention consists in the construction and novel combination of parts hereinafter fully described, illustrated in the accompanyingdrawings, and pointed out inthe claim hereto appended; it being understood that various changes in the form, proportion, size and minor details of construction within the scope of the claim may be resorted to without departing from the spirit or sacrificing any of the advantages of the invenltion.

In the drawings: Figure 1 is a side elevawith my invention showing the application 3 of the clamping tool, Fig. 2 is a similar view but showing the parts of the spear in their vset or operative position, the clamp being removed, Fig. 3 is a longitudinal sectional view, Fig. 4: is a horizontal sectional view taken on the line 44 of Fig. 2, Fig. 5 is a 55 of Fig. 1, Fig. 6 is a perspective view of the spear body, the detachable parts being removed, Fig. 7 is a perspective view of the abutment or collar. Fig. 8 is a perspective view of one of the wedges.

Like reference numerals designate corre sponding parts in all the figures of the drawings.

Referring to the drawings, the spear consists of a body portion, which is designated as a whole by the reference numeral 5. This portion comprises a central cylindrical portion 6, and above this central portion, the

body or stem is reduced, as indicated by the reference numeral 7 and terminates in the usual tapering screw 8. The lower part of the central portion 6 is cut away on opposite sides to form downwardly diverging faces, each face being beveled longitudinally as'indica-ted by the reference numerals 9-9. Formed in this portion intermediate the beveled faces 9 is a longitudinal dovetailed slot 10 which extends from the shoulders 11-11 formed by said, cutaway portions to the end of the central portion 6. The body portion 5 below the central portion 6 is reduced to form a cylindrical stem 12 and a" consequent shoulder 13. Formed in the stem 12 directly below the central portion and in the same plane as the slot 10 is an elongated transverse opening 14. The extreme lower end of the stem is threaded, as indicated by the reference numeral 15, and formed in said threaded end is a transverse opening 16. The extreme lower end of the stem is formed with a seat 12* ada ted for a purpose hereinafter more fully escribed.

The invention further comprises a pair of wedges 1717. Each wedge is of a size to fill a corresponding recess of the lower part of the central portion 6, and form a continuation of said central portion. Each wedge includes a curved outer wall 18 which is formed with a series of lateral teeth 19 which combine with lateral teeth 20, formed on the lower part of the central portion 6 between the beveled faces to form continuous bevel teeth. The inner portion of each wedge is recessed to form inclined faces 2121 which are arranged at an angle to each other corresponding to the angle between an adjacent pair of beveled faces 99. Projecting rearwardly between the faces 21 is a longitudinal undercut rib 22 of a size to slide freely within the respective dovetailed slot 10.

Slidably mounted upon the stem 12 is a collar 23 forming an abutment. This collar is formed adjacent its upper end with diametrically opposed openings 2424 adapted for receiving a transverse pin 25, said pin projecting through the elongated opening 14 of the stem to limit the longitudinal movement of said collar and to also prevent the rotation thereof. Formed in the upper face of the collar at right angles to the openings 24 are diametrically opposed radial slots 2626 and 27-27 forming consequent central projections 27 27 respectively. It is to be noted in this connection that these projections are disposed below the shoulder 13 intermediate the wedges 17. The underface of the collar is formed with a counterbore 28.

Engageable with the threaded end 15 of the stem is a nut 29 which is formed in its upper face with counterbore 30 of a size to correspond to the counterbore 27 of the collar. Disposed around the stem is a coil spring 31, one end thereof being disposed within the counterbore 27 of the collar and the other end within the counterbore 30 of the tensioning nut. This nut is formed on its periphery with a series of spacing seats 32 adapted to be engaged by a tool (not shown) to rotate said nut when it is desired to remove the same. It will be observed in this connection that the spring tends to normally urge the collar tightly against the shoulder 13, and thereby retain the wedges 17 in their inoperative positions, as clearly shown in Fig. 1 of the drawings. Associated with the outer end of the stem 12 and bearing against the nut 29 is a jam nut 33 which is secured to the stem by means of a cross pin 34.

In practice, when it is desired to slide the collar downwardly so as to permit the wedges slipping downwardly and consequently outwardly, there is employed a novel form of clamp, which is designated as a whole by the reference numeral 35.

,said rod terminating at its other end in a crank 42. In operation, the legs 37 are respectively disposed on opposite sides of the lower portion of the spear and the feet 38 are respectively engaged within either pair of the slots 26 or 27 of the collar. The threaded end of the operating tool is en- 'gaged within the seat 12 of the stem 12. Upon rotation of the rod in one direction, the U-shaped clamp will be moved downwardly carrying with it the collar. After this collar has been shifted a distance sufficient to permit of the wedges projecting outwardly to engage a respective casing, spacing blocks 43 are each disposed between a projection 27 of the collar and the shoulder 13. The clamp is then removed and the spacing blocks will thus serve to retain the collar in its adjusted position against the tension of said spring. It will thus be observed that these blocks are disposed between and in spaced relation to the wedges, so that said wedges will have an unobstructed sliding movement. The spear is then inserted within the casing, and as will be readily understood, upon upward movement thereof the circumferential teeth of the wedges will tightly grip the casing. When it is desired to remove the spear for any cause, the said spear is jarred by any convenient means, and as a result, the blocks 43 are caused to drop into either of the slots 27 or 28 of the collar, and thereby permit the coil spring to return the collar to its normal position against the shoulder 13. As this collar returns, the wedges are likewise returned to their normal positions, so that the spear will then be free to be removed from the casing.

What is claimed is:

A casing spear consisting of a body portion having its lower end reduced to form a stem and a consequent shoulder, the lower end of the body above the shoulder being downwardly diverging faces, wedges respectively mounted to slide longitudinally there along, a nut mounted on the lower end of the stem, a collar forming an abutment for the wedges slidably mounted on the stem intermediate the shoulder and nut and having a pin and slot connection with said stem, and a coil spring disposed around the stem intermediate the nut and collar for urging the latter against the shoulder, said collar being formed on its upper face with diametrically opposed pairs of spaced slots In testimony whereof, I affix my signaforming];O consequent progections, said projecture, in presence of two witnesses.

tions eing dispose interme iate the wedges whereby a spacing block may be FRANK BAKER ositioned between the projections and Witnesses:

shoulder to hold the collar downwardly M. E. WAGNER,

against the tension of the spring. FRED W. Voens.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

